Have media content and chrome browser tests load data from media/test/data
Update remaining encrypted media browser tests to use new player app.
This is similar to r282795 + fix to GN builds. The fix is in
media/BUILD.gn file.
BUG=379314
Review URL: https://codereview.chromium.org/408993002
git-svn-id: svn://svn.chromium.org/chrome/trunk/src@284803 0039d316-1c4b-4281-b951-d872f2087c98